https://bugs.kde.org/show_bug.cgi?id=415872

            Bug ID: 415872
           Summary: kwin_wayland random segfault
                    libQt5Qml.so.5.14.0[7fe09a171000+307000]
           Product: kwin
           Version: 5.17.4
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: kwin-bugs-n...@kde.org
          Reporter: t...@r.je
  Target Milestone: ---

SUMMARY

kwin_wayland crashes intermittently and sends me back to the SDDM login screen.
Generally around every 6-8 hours of use, sometimes sooner. 

It seems to only be a matter of time.

Usually when manipulating windows. Sometimes when switching virtual desktops.
Unfortunately I cannot seem to find something that triggers it consistently. 

STEPS TO REPRODUCE
1. Use kde on wayland
2. Interact with the desktop

OBSERVED RESULT

Jan 04 13:30:38 desktop audit[13920]: ANOM_ABEND auid=1000 uid=1000 gid=1000
ses=9 pid=13920 comm="kwin_wayland" exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 13:30:41 desktop systemd-coredump[14565]: Process 13920 (kwin_wayland)
of user 1000 dumped core.
Jan 04 13:30:52 desktop audit[14916]: ANOM_ABEND auid=1000 uid=1000 gid=1000
ses=10 pid=14916 comm="kwin_wayland" exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 13:30:52 desktop kernel: kwin_wayland[14916]: segfault at 28 ip
00007fe09a17760c sp 00007ffc135bd040 error 4 in
libQt5Qml.so.5.14.0[7fe09a171000+307000]
Jan 04 13:30:52 desktop kernel: audit: type=1701 audit(1578144652.676:500):
auid=1000 uid=1000 gid=1000 ses=10 pid=14916 comm="kwin_wayland"
exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 13:30:55 desktop systemd-coredump[15607]: Process 14916 (kwin_wayland)
of user 1000 dumped core.
Jan 04 13:31:26 desktop audit[15949]: ANOM_ABEND auid=1000 uid=1000 gid=1000
ses=11 pid=15949 comm="kwin_wayland" exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 13:31:26 desktop kernel: kwin_wayland[15949]: segfault at 28 ip
00007fdb376d760c sp 00007fffae5e2430 error 4 in
libQt5Qml.so.5.14.0[7fdb376d1000+307000]
Jan 04 13:31:26 desktop kernel: audit: type=1701 audit(1578144686.282:568):
auid=1000 uid=1000 gid=1000 ses=11 pid=15949 comm="kwin_wayland"
exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 13:31:29 desktop systemd-coredump[16639]: Process 15949 (kwin_wayland)
of user 1000 dumped core.
Jan 04 14:29:53 desktop audit[23599]: ANOM_ABEND auid=1000 uid=1000 gid=1000
ses=16 pid=23599 comm="kwin_wayland" exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 14:29:53 desktop kernel: kwin_wayland[23599]: segfault at 28 ip
00007f95bfb4e60c sp 00007fff63a4d910 error 4 in
libQt5Qml.so.5.14.0[7f95bfb48000+307000]
Jan 04 14:29:53 desktop kernel: audit: type=1701 audit(1578148193.434:849):
auid=1000 uid=1000 gid=1000 ses=16 pid=23599 comm="kwin_wayland"
exe="/usr/bin/kwin_wayland" sig=11 res=1
Jan 04 14:29:55 desktop systemd-coredump[78101]: Process 23599 (kwin_wayland)
of user 1000 dumped core.


This is the segfault I get. It seems random but dragging/dropping Xorg windows
seems to be the primary cause, the last culprit was firefox. 

EXPECTED RESULT

No crash

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Arch Linux / Plasma 5.17.4
(available in About System)


Let me know if there's anything else I can do to debug this.


This might be related to #401350 but that's a different error.

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